/*
 * This file is part of JSTUN.
 *
 * Copyright (c) 2005 Thomas King <king@t-king.de> - All rights
 * reserved.
 *
 * This software is licensed under either the GNU Public License (GPL),
 * or the Apache 2.0 license. Copies of both license agreements are
 * included in this distribution.
 */
package de.javawi.jstun.attribute;

import de.javawi.jstun.util.Utility;
import de.javawi.jstun.util.UtilityException;

public class Username extends MessageAttribute {
  String username;

  public Username() {
    super(MessageAttribute.MessageAttributeType.Username);
  }

  public Username(String username) {
    super(MessageAttribute.MessageAttributeType.Username);
    setUsername(username);
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public byte[] getBytes() throws UtilityException {
    int length = username.length();
    // username header
    if (length % 4 != 0) {
      length += 4 - length % 4;
    }
    // message attribute header
    length += 4;
    byte[] result = new byte[length];
    // message attribute header
    // type
    System.arraycopy(Utility.integerToTwoBytes(typeToInteger(type)), 0, result, 0, 2);
    // length
    System.arraycopy(Utility.integerToTwoBytes(length - 4), 0, result, 2, 2);

    // username header
    byte[] temp = username.getBytes();
    System.arraycopy(temp, 0, result, 4, temp.length);
    return result;
  }

  public static Username parse(byte[] data) {
    Username result = new Username();
    String username = new String(data);
    result.setUsername(username);
    return result;
  }
}
